Summary:If room temperature is 85 °C, which will make your LED degrade faster than a 25 °C room temperature, and the output is around 250 lumens, and it has good heatsinking, and you use it 4 hours a day, your flashlight LED will take at least 50 years to degrade to 90%, outliving a good few circuit board replacements in that time.
note - direct drive the LED to see if it is damaged, 3V
usually the boards get damaged first but you will also see damage to the LED after a drop, or because of humidity. I have replaced several lamps (for various reasons) and have seen about 4 CREE torches fail because of damage to the LED
Quote from: dks on February 19, 2018, 07:49:27 PMnote - direct drive the LED to see if it is damaged, 3VPeople regularly direct drive LEDs with 4.2v lion batteries.
Quote from: Pablo O'Brien on February 19, 2018, 07:55:05 PMQuote from: dks on February 19, 2018, 07:49:27 PMnote - direct drive the LED to see if it is damaged, 3VPeople regularly direct drive LEDs with 4.2v lion batteries.I know - this was just a suggestion for an easy test to see if the LED is damaged use 2AAs for example
I just figured that a LED outlives the electronics behind them. Unless it gets fried because of an error like on an outside light here... smurfy cheap junk...So... nothing new I guess...All the fuzz for nothing
And it is the same story with another (shorter) test, run at 105°C ambient temp(WHERE DO THEY THINK YOU'D BE USING THESE LEDS?! )
Quote from: Pablo O'Brien on February 19, 2018, 07:47:13 PMAnd it is the same story with another (shorter) test, run at 105°C ambient temp(WHERE DO THEY THINK YOU'D BE USING THESE LEDS?! )Hell of course.See you there.